Best bet is here: http://www.minecraftforum.net/…d-11152012/#reciperemover
Basically just add the rubber boots to the blacklist (I don't know if you have to create the file or the mod creates it) and the item's recipe will be gone.
It has been mentioned in the recipe remover thread that it does not work on IC2 items. From what I understand IC2 uses a custom recipe manager.